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中文核心期刊

非均匀积污下高压绝缘子电位及电场分布特性

DISTRIBUTION CHARACTERISTICS OF ELECTRIC POTENTIAL AND ELECTRIC FIELD ALONG HV INSULATORS UNDER NON-UNIFORM CONTAMINATION

  • 摘要: 高压绝缘子在输变电工程中承担着绝缘的重要角色. 由于工业化的飞速发展, 雾霾和沙尘等天气的频繁出现, 污秽颗粒在大气流场的作用下在绝缘子表面沉积, 容易发生污闪事故, 严重影响着电网的安全运行. 将高压绝缘子污闪发生的主要过程-绝缘子的动态积污和表面电场畸变过程进行耦合分析, 探究污闪发生的机理. 建立绝缘子周围的欧拉-欧拉气固两相流模型, 对绝缘子动态积污过程进行数值模拟, 获得绝缘子表面的非均匀积污层分布; 创建其表面导电层单元, 结合有限元方法建立积污绝缘子电场模型, 对非均匀积污层分布的绝缘子串进行电位及电场分析. 研究结果表明: 在积污层非均匀分布情况下, 绝缘子表面积污层周向位置对其电位分布的趋势影响较小, 但对绝缘子表面电场畸变的发生位置影响较大. 随着周向位置的变化, 电场畸变位置的偏移也不同, 且侧风面电场畸变的偏移最大. 随着积污层电导率的增大, 电场强度大于清洁绝缘子表面的场强, 且背风侧的场强畸变最大.

     

    Abstract: HV insulators take on an important role in power transmission engineering. Because of the rapid development of industrialization, sandstorms and smog often happen. Contamination particles deposit on insulator surface under air flow field, pollution high voltage flashover accidents are prone occur, which seriously affects the safe operation of the power grid. In this paper, to investigate the mechanism of pollution high voltage flashover, a coupling analysis of dynamic accumulation and electric field distortion on insulator surface is explored. A model of gas-solid two phase flow around insulator is established by Euler-Euler approach to simulate the dynamic pollution accumulation process. Thus the distribution of non-uniform contamination layer on the insulator surface is obtained. The surface conductive layer element of the contamination layer is created, and it is used in finite element model of electric field on the polluted insulator, and the electric potential and electric field of the insulator string with non-uniform contamination are analyzed. The results show that: in the case of non-uniform contamination layer, the circumferential position of the polluted layer on the insulator surface has less influence on the trend of its potential distribution, but has greater influence on the position of electric field distortion. With the variation of circumferential position, the deviation of electric field distortion position is different, and maximum deviation occurs on crosswind. The electric field intensity is larger than clean insulator surface with increase of contamination layer conductivity. Furthermore, the field intensity distortion on leeward is the largest.

     

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